One of the little known features of Writer which you may find quite useful is the possibility of jumping between reminders. Reminders are not highlighted in any way in the document, so you cannot see where they are, but they are a handy tool.
To set a reminder at the cursor's current location, click on the
icon in the Navigator. You can set up to 5 reminders in a document (setting another causes the first to be deleted). To jump between reminders, first select the same icon on the Navigation toolbar. Now the Previous and Next icons are active for reminders.